When I was 21 a decade ago I worked at an FE college, and I ended up dating one of the students, who was the same age, once he and I had both left. I wasn't their teacher, just did some intervention sessions with them, but we didn't get in touch until we'd both left permanently.
After several months had passed, it became apparent that barely any of his friends knew about me.
He had been in touch with a friend of his from the course on social media for a couple of weeks, and apparently not once in this time had he mentioned me, even though he had pretty much moved in with me by this point and we'd been on holiday together etc.
He said 'oh it just didn't come up in conversation'.
He refused to acknowledge our relationship on social media, I know it's just social media but when you're 21 I guess it matters.
I asked him about it and he said that he kept our relationship a secret because he 'knew the girls would make bitchy comments'.
I don't know why he was so certain that they'd make rude comments.
Only his 2 closest friends knew, and one of them must have told some of their other friends we were dating, and my ex started saying what a prick he was.
Anyway a few months down the line he gave me his old phone, and i deleted some old texts off of it. One of them was to one of the classmates and it said, "Now we're more serious our relationship is no longer a secret"
Looking back I had no self esteem, but you don't always when you're 21 I suppose. I don't know why i put up with that. Have you ever been kept secret?